Rock dynamic mechanical properties and dynamic stress balance of sandstone specimens with different sizes

ZHANG Sheng; WANG Zheng; ZHANG Xulong; RONG Tenglong; ZHOU Rui; XU Ruize

doi:10.11883/bzycj-2021-0447

Volume 42 Issue 10

Oct. 2022

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ZHANG Sheng, WANG Zheng, ZHANG Xulong, RONG Tenglong, ZHOU Rui, XU Ruize. Rock dynamic mechanical properties and dynamic stress balance of sandstone specimens with different sizes[J]. Explosion And Shock Waves, 2022, 42(10): 103102. doi: 10.11883/bzycj-2021-0447

Citation:

ZHANG Sheng, WANG Zheng, ZHANG Xulong, RONG Tenglong, ZHOU Rui, XU Ruize. Rock dynamic mechanical properties and dynamic stress balance of sandstone specimens with different sizes[J]. Explosion And Shock Waves, 2022, 42(10): 103102. doi: 10.11883/bzycj-2021-0447

Citation:

ZHANG Sheng, WANG Zheng, ZHANG Xulong, RONG Tenglong, ZHOU Rui, XU Ruize. Rock dynamic mechanical properties and dynamic stress balance of sandstone specimens with different sizes[J]. Explosion And Shock Waves, 2022, 42(10): 103102. doi: 10.11883/bzycj-2021-0447

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Rock dynamic mechanical properties and dynamic stress balance of sandstone specimens with different sizes

doi: 10.11883/bzycj-2021-0447

1.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2021-10-28
Rev Recd Date: 2022-03-25

Available Online: 2022-03-29

Publish Date: 2022-10-31

Abstract

Abstract

Aiming at a clarification of the differences in dynamic mechanical properties of rock specimens with different sizes when characterized by a large diameter split Hopkinson pressure bar system, sandstone specimens with three different diameters (50, 75 and 100 mm) and five kinds of length-diameter ratios (0.4, 0.5, 0.6, 0.8 and 1.0) were employed for impact experiments on a pressure bar of diameter 100 mm. The variations of stress versus strain and strain rate versus time of specimens with different sizes were analyzed. The concept of a superposition coefficient for comparing waveform alignment overlap was then proposed, and together with the equilibrium factor it was used to study dynamic stress equilibrium. Thus, the recommended size range of specimens was determined for large-diameter split Hopkinson pressure bar tests. Also, a high-speed camera was used to observe the dynamic damage of the specimens. The results show that when the length-diameter ratio of specimen remains the same, the tested dynamic compressive strengths are close for the specimens of diameter 75 mm and 100 mm, but it is affected by more pronounced specimen length for the specimens of diameter 50 mm. With the increase of specimen’s diameter, the curve of strain rate versus time changes from single peak to double peak. The small-size specimen is more prone to axial splitting failure, and the large-size specimen produces larger tensile stress due to the superposition of internal stress waves, which is prone to the composite failure of spallation tension and axial splitting. When the specimen with a diameter of 75 mm and the length-diameter ratio of 0.3–0.4 is used, the coincidence degree after waveform alignment is better, sufficient stress balance time is achieved before initial failure, and the strain rate loading is more effective. It is helpful to reveal the size effect on the rock dynamic compression mechanical properties with different sizes of specimens, as it can provide a good reference for the specimen size selection in large-diameter SHPB tests.
- dynamic compression mechanical properties,
- size effect,
- stress balance factor,
- large-diameter split Hopkinson pressure bar,
- sandstone

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References(37)

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